I would personally not buy anything older than a late-80 bike, which is first generation Index Shifting. IS=greatest thing since sliced bread. I would want the Ad to say "low miles, well-kept, new/refurb hubs, turn smooth." and if all possible from a local seller so I can feel it for myself.

Comfort entirely depends on frame size (u know what frame size suit u I assume) and saddle (which u can swap out).